Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fac64f6df28526…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 08:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: abbcf890650305b643ef2d60783841b2 SHA-1: dcfe05182944e0bd9e21ab57d9db4e4261a7e747 SHA-256: b2fac64f6df28526c99d88ae809ee24cd919266e7274ac053517b07d2ae83ae7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a deceptive web presence. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bakefruit.com/uploads/files/202109052019012842.pdf In PDF document text
    • http://special-pharma.com/upload/files/gegitepem.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/pebaloraf.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/vonujixawenaji.pdfIn PDF document text
    • https://avela.md/userfiles/file/xikidojekubusanosipisefe.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/99384554295.pdfIn PDF document text
    • https://pokereshop.cz/data/file/12290812861.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/98119373632.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/75125889481.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/milegufozavu.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/21518093374.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/11505060647.pdfIn PDF document text
    • http://innotack.com/userfiles/files/7753358881.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/11021966205.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/24994464418.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/34140281449.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/kuredoriforugitomaw.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/dadejad.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/xozupuselupatoxulope.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/pawufoborada.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/11179841405.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/lijikusebikalomapedilod.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/99386062777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+earn+free+robux+without+doing+anythingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 17548 bytes
SHA-256: 863b23241ee95d601f8fd48cefa183d697039d4156a33bee37a0a71a3c32990b
font_01_sfnt_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 10952 bytes
SHA-256: 6c1836a43bf09b5998a61dc92bc252b2eaa9100310158f39333a8323e09118ae

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